Well, a month or so after my initial post, I will answer my own question... It may help someone.
So my issue was the dreaded Auxiliary Heater that had failed. Again this is a late 2019 roadster with 3.1k miles on the clock.
I found out on a cold winter morning when the heater only kicked in 20 minutes inside the drive as the petrol engine came to temperature.
2nd issue I had with this car, previous one was the retractable roof failure which needed a new module.
As to the auxiliary heater that appears to be a well known issue, there was no explanation from the BMW dealership as to why it failed.
The cost was just over £1,300 and covered by the extended warranty.
I will renew the warranty for as long as i own this car.
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